Protostars are
A) stars made almost entirely out of protons.
B) objects with masses less than about 0.08 solar masses,which do not have enough mass to become true stars.
C) old stars,contracting after using up all of their available hydrogen fuel.
D) very young objects,still contracting before becoming true stars.

Question

Quizplus · Accepted Answer

Protostars are very young objects that are still contracting under their own gravity before becoming true stars. They are in the process of accumulating mass and building up their core temperature through gravitational collapse. Once they reach a critical temperature and pressure, nuclear fusion will begin and the protostar will officially become a star. Choices A, B, and C are incorrect because they do not accurately describe protostars.

Protostars Are